Credit crunch and $90 million legal settlement over antitrust suit by rival developer Caruso crushing the fortune of America's second-largest shopping mall owner. Net worth down $1.1 billion in past 12 months as shares of General Growth Properties have fallen 60% from 2007 highs. Grocer's son developed his first shopping center in Cedar Rapids, Iowa 1954 with 2 brothers. Took public 1970; sold stake, doubled his money 15 years later. Relocated to Chicago after brother Martin's death 1995. Today GGP owns more than 200 shopping malls. Sales: $3.3 billion. Stepped down from company's board earlier this year, still chairman emeritus. Son, John, is chief exec. Donated $23 million to Aspen Music Festival.